I've released Zwiki 0.52.1. We are aiming for a 0.52.x release that's
extra-solid, so please keep reporting issues and I will make another
bugfix release if needed. Thanks!

Summary

Bugfix release.
Upgrade notes
If you installed 0.52 in a CMF or Plone site for the first time,
the zwiki_standard skin layer may not have been installed and some
images may appear broken. If so, uninstall and reinstall Zwiki in
add/remove products.

Changes

Installing
* fix backwards compatibility for old custom templates like
editform (#1241)
* the zwiki_standard layer was not being registered during
cmf/plone installation; don't add the unnecessary "Zwiki" skin
any more
* Add Zwiki was not setting page type based on the file suffix
(#1247)
Configuring
* don't html-quote the site header, if configured (#1240)
Browsing
* fix blank lines in RST page comments (#1248)